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Finding the Fourth Proportional to 101,013.91, 139,405.46 and 55,691.80

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Solution

The fourth proportional to 101,013.91, 139,405.46 and 55,691.80 is: 76,858.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,013.91 : 139,405.46 = 55,691.80 : x
  2. Step 2: Convert to fraction form
    101,013.91/139,405.46 = 55,691.80/x
  3. Step 3: Cross multiply
    101,013.91x = 139,405.46 × 55,691.80
  4. Step 4: Simplify right side
    101,013.91x = 7,763,741,154.41
  5. Step 5: Solve for x
    x = 7,763,741,154.41/101,013.91
  6. Step 6: Final answer
    x = 76,858.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.